Select Page: 1 2 3 4 5 6 7 8 9 10 11 Next
Control.com topic...
PLCs
Originally posted by rajesh patil on 23 April, 2014 - 2:28 pm
why the modbus mapping register is visible at register address +/- 1 address.
New Replies:
Hi, the numbering is introduced in the official Modbus Application Protocol Specification (page...
Guys who live in cubes write the code. Hence, it depends on whether the guy who wrote the code...
Topic: PLCs and related questions.
from the Automation and EMS department...
Unity Pro communications
Originally posted by Bhadresh Sarvaiya on 22 April, 2014 - 6:49 am
Need help for communication of NOE with M340.
New Replies:
This is compatibility error due to upgrade of firmware in NOE. Likely Unity V5 does not support the...
Topic: PLCs and related questions.
from the Urgent department...
Time and Date in Honeywell control builder
Originally posted by Mostafa on 8 April, 2014 - 2:48 pm
How could use time and date in control module?
New Replies:
Hi Mostafa, I saw your pictures, please go to the CM tree at your left and under the root node...
> Could you upload a picture showing your control builder? ...
> but unfortunately i couldn't find variables CEE1.HOUR...... > i have many control module...
thank you so much sir but unfortunately i couldn't find variables CEE1.HOUR...... i have many...
Hi Mostafa, you could get the hour, minute and second variables from the CEE under the...
Topic: PLCs and related questions.
from the ENG department...
Triconex system
Posted by HAIRI on 23 April, 2014 - 1:48 am
What happens when Triconex system CPU fails?
Topic: PLCs and related questions.
from the Forum department...
Yokogawa error message
Originally posted by Nacer on 8 August, 2011 - 10:09 am
Yokogawa error message
New Replies:
You've basically created a tag without it being registered in the taglist. This can be done if you...
Topic: Human-Machine Interface and SCADA.
from the Automation List department...
Android tablet for HMI?
Originally posted by Ken E on 3 June, 2011 - 11:18 am
Using an Android tablet as an all in one PLC.
New Replies:
By Peter Fredriksson on 22 April, 2014 - 4:32 pm -
Hello, I hope you all will not see my post as a advertisement. We are a small family company...
Hello, I found a very good free apps for android and IOs devices (Iphone, Ipad) that is a SCADA...
Topic: PLCs and related questions.
from the Modbus department...
S7 PLC as a MODBUS slave
Originally posted by Fatima on 22 April, 2014 - 8:29 am
would like to make S7 PLC as a MODBUS slave and a PC Master MODBUS
New Replies:
Forgot to mention in my previous post. The reason I distinguished between tech and business aspects...
Have never done it using the Siemens Ethernet port, but I have done that on a 315-2DP using a...
Topic: PLCs and related questions.
from the gad trubine control system department...
moog servo valve operation
Originally posted by VK on 1 November, 2012 - 10:30 am
How does a MOOG servo valve operate?
New Replies:
Jyshen, You are most welcome....
Dear CSA, Thanks for your superb informative response. Your passion and sincerity to share your...
Topic: Motion control, servos, steppers, etc.
from the Forum department...
Driving a Stepper Motor
Posted by Hans on 18 April, 2014 - 3:40 pm
I am seeking advice on the best methods to effectively control a stepper motor.
Topic: Communications systems and equipment.
from the Instrumentation department...
ML1400 PLC communicate PIC 16f874 over modbus protocol
Posted by Srinivas on 17 April, 2014 - 11:02 am
ML1400 PLC communicate with PIC 16f874 over modbus protocol and write data to LCD connected to microcontroller
Topic: Communications systems and equipment.
from the Automation department...
DCS Yokogawa Communication Issue
Originally posted by Zarar on 13 April, 2014 - 2:21 pm
Yokogawa DCS communication with Modbus slave device using ethernet redundant connection with ALE111.
New Replies:
By Elbert van der Bijl on 17 April, 2014 - 5:15 am -
this behavior is by design and it will not occur when the Modbus slave is correctly responding to...
Topic: Communications systems and equipment.
from the Automation and EMS department...
Modbus Data transmission time
Originally posted by Bhadresh Sarvaiya on 12 April, 2014 - 7:58 am
How to calculate time to receive data from slave to master in daisy chain connection of slaves, if my slaves are 20 and single master.
New Replies:
By Patrick Lansdorf on 16 April, 2014 - 1:55 am -
Hi, I have made a simple Excel sheet, where one can calculate the line time. You will need to...
Slick idea on the prefetch! ...
By Lynn August Linse on 15 April, 2014 - 9:31 am -
>> What's a rule-of-thumb value for >> RTU-TCP latency in a Digi Modbus bridge...
By Bhadresh Sarvaiya on 15 April, 2014 - 1:29 am -
> Mr. Linse, > What's a rule-of-thumb value for RTU-TCP latency in a Digi Modbus bridge...
Mr. Linse, What's a rule-of-thumb value for RTU-TCP latency in a Digi Modbus bridge product? ...
By Lynn August Linse on 14 April, 2014 - 10:36 am -
Just be careful to accommodate the delay-back off during failure. With a single device, it might...
By Bhadresh Sarvaiya on 13 April, 2014 - 5:14 am -
Thank you for your kind reply.. but i didn't get answer as i want.. i didn't understand your...
You know - the word size, 11 bits - the number of words in the master message - silent...
Topic: Communications systems and equipment.
from the Forum department...
SCADA RTU in Substation
Posted by SSU on 16 April, 2014 - 12:56 am
Why use SCADA RTU in a substation? What is the purpose of SCADA RTU?
Topic: Communications systems and equipment.
from the Forum department...
8-bit data types in Modbus registers
Originally posted by Jay on 10 April, 2014 - 5:26 am
Are 8-bit data types obsolete for Modbus?
New Replies:
By Lynn August Linse on 14 April, 2014 - 10:39 am -
A bit of historical trivia... Modbus never had 8-bit data types. The original PLC were made back in...
> Since registers are always 16 bits, does it even make sense to provide data types of 8 bits...
Topic: Power generation equipment control.
from the Engineering department...
Siemens marshaling wire
Posted by Raymond Mpofu on 14 April, 2014 - 8:16 am
Brand name of Siemens' 0.5mm thick marshaling wire
Topic: Software, including programming, OS issues, etc.
from the Annoying Exceptions department...
Negative Acknowledge and Bad Karma
Originally posted by Julie in Austin on 18 February, 2012 - 2:05 pm
How do you feel about security exceptions not being, you know, informative?
New Replies:
> What product are you working on, and are there any other security enhancements you are making?...
Topic: PLCs and related questions.
from the Automation List department...
Interfacing VFD with PLC
Originally posted by Anonymous on 29 May, 2007 - 9:09 pm
How to interface variable frequency drives with PLCs?
New Replies:
If You Want only on/off control from PLC, then connect the drive to digital output module. and if...
Originally posted by andyt76 on 24 July, 2012 - 7:19 am
Connecting a Honeywell UDC temperature controller to Modicon PLC via Modbus. any ideas on this?
New Replies:
Latest edition of Honeywell's Modbus RTU communications manual 51-22-25-66, Rev T, dated February...
Topic: Sensor technologies.
from the maintenance department...
Process Switches NO NC definition
Originally posted by Normally on 19 August, 2011 - 7:12 pm
What "normally" means in process switches.
New Replies:
Dear Sir, Normally means then initial condition of any switch or relay without pressing or...
Topic: PLCs and related questions.
from the Instruments Department department...
Modbus Max. Length
Originally posted by Franco Kew on 8 April, 2014 - 10:34 pm
Measure the total Modbus Length
New Replies:
No that's a star and it's a bad idea because 20 M of unterminated cable will give you reflections...
Dear CWW, Maybe I use the wrong wording in my post, but I am not using the star topology. I try...
Hadn't thought of segmenting the network with repeaters to fix the topology - slick! Franco,...
By Lynn August Linse on 9 April, 2014 - 9:46 am -
This is an RS-485 issue, not Modbus question. Max length is more an issue of the cable quality...
Originally posted by V K GUPTA on 9 April, 2014 - 12:34 pm
Communication between SIEMENS S7-400 PLC Scalance card to Yokogawa DCS CENTUM CS3000R3
New Replies:
you need to use Siemens CS-3000 module to convert your signal to modbus TCP/IP signal and interface...
By Patrick Lansdorf on 10 April, 2014 - 2:17 am -
Hi, I am guessing that the PLC is a Profibus master... You can use a gateway, such as: ...
Topic: PLCs and related questions.
from the Forum department...
Flow Rate Calculations S7-1200
Posted by shahien on 10 April, 2014 - 3:40 am
Flow Rate Calculations S7-1200
Topic: Continuous process industries, DCS questions.
from the Forum department...
2oo3D voting
Originally posted by amanemisa on 8 April, 2014 - 3:54 am
Explain if 1oo2D voting is just similar to 2oo3 voting for ESD system.
New Replies:
Let's start with your requirement of tripping of valve on rise of line pressure beyond high limit....
Select Page: 1 2 3 4 5 6 7 8 9 10 11 Next
 
 

Your use of this site is subject to the terms and conditions set forth under Legal Notices and the Privacy Policy. Please read those terms and conditions carefully. Subject to the rights expressly reserved to others under Legal Notices, the content of this site and the compilation thereof is © 1999-2014 Nerds in Control, LLC. All rights reserved.

Users of this site are benefiting from open source technologies, including PHP, MySQL and Apache. Be happy.


Fortune
Demand the establishment of the government
in its rightful home at Disneyland.
Advertise here
Advertisement
our advertisers
Help keep our servers running...
Patronize our advertisers!
Visit our Post Archive